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Description
Optimal Audio SmartAmp 20: 4-Channel 125W Amplifier with DSP/EQThe Optimal Audio SmartAmp 20 is a powerful and versatile four channel amplifier designed to deliver exceptional audio performance in commercial settings. Equipped with integral Digital Signal Processing (DSP), it optimizes the performance of the Optimal Audio loudspeaker range, making it ideal for various applications from retail environments to live music venues. Features Four Channel Output: Delivers 4 x 125W power output, supporting both low
The Optimal Audio SmartAmp 20 is a powerful and versatile four-channel amplifier designed to deliver exceptional audio performance in commercial settings. Equipped with integral Digital Signal Processing (DSP), it optimizes the performance of the Optimal Audio loudspeaker range, making it ideal for various applications from retail environments to live music venues.
Features
- Four-Channel Output: Delivers 4 x 125W power output, supporting both low impedance (4Ω-16Ω) and high impedance (70V/100V) speaker connections.
- Built-in DSP: Features digital signal processing with EQ and limiter presets specifically tailored for Optimal Audio loudspeakers, ensuring optimal sound quality.
- Power Sharing Technology: Allows for a maximum of 250W output shared between each pair of channels, enhancing efficiency and flexibility in power distribution.
- Compact Design: Half-width 1U rackmount design enables two units to be mounted side by side, saving valuable rack space.
- Universal Power Supply: Power factor correction technology supports universal AC mains operation, providing reliable performance worldwide.
Specifications
- Type: Class D power amplifier with DSP
- Power Output (4Ω - 16Ω): 4 x 125W
- 70V-100V Output: 4 x 125W
- Cooling: Forced air cooling with fan
- Analogue Inputs: 4 balanced line inputs on Euroblock connectors
- Signal to Noise Ratio: > 100 dB (A-weighted, 20 Hz – 20 kHz, 8 Ω load)
- Frequency Response: 20 Hz – 20 kHz (+0/-0.25 dB at 8 Ω load)
- Total Harmonic Distortion: < 0.05 % (20 Hz – 20 kHz, 8 Ω load)
- Dimensions: (W) 220mm x (H) 44mm x (D) 353mm
- Weight: 2.4kg
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.5 ★★★★★
Based on 7 reviews
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Product Reviews
★★★★★ 1
You get what you pay for
Size: XX-Large, Color: Eggshell White Black Mariner Stripe
Like most of the other reviews here, the shirt runs too small and too short. Material was also incredibly uncomfortable. It also wasn't the color I was hoping it would be, but that's on me for not reading the fine print (eggshell white was very much not white)
If you're looking at this for a certain costume/cosplay idea, it's probably not what you're looking for.
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Reviewed in the United States on February 18, 2026
★★★★★ 5
Solid fit
Size: X-Large, Color: Eggshell White Black Mariner Stripe
Easy fit, comfortable material. Dont expect it to last forever but at the price its solid for the purpose of a halloween costume.
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Reviewed in the United States on November 1, 2025
★★★★★ 3
Runs small
Size: X-Large, Color: Navy
Runs small and is short. Nice dark navy color. I ordered a size up and it is still small.
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Reviewed in the United States on February 26, 2026
★★★★★ 5
Great tee
Size: X-Large, Color: Medium Grey Heather
It’s a nice cotton material…not thin, just perfect. After washing, it also kept its shape.
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Reviewed in the United States on February 18, 2026
★★★★★ 5
Very well made Oxford casual shirts.
Size: X-Large, Color: Sky Blue
I've ordered 8 of these Button-down collared, long sleeved Oxford shirts in eight different colors. I'm 6', weigh 195. And have a 44" chest and fairly broad shoulders. The XL give me ample room, plenty of shirt tail to tuck in. And are well made. The shirts have a nice soft feeling to them. If you wash them with like items, and dry them likewise, taking them out before the cycle ends and hanging them. You won't have a single wrinkle. The shirts are true to color, and true to size if you follow the size guideline. These are not tailor fit, but regular fit shirts. Fabric quality seems very durable and well made. There is no smell when receiving the shirts. No more so than buying a shirt at a retail store. They do come in a vacuum bag. The shirts are a little heavier than a poplin shirt and can be worn year-round. These are great casual shirts for jeans and a sport coat, or slacks. I like the quality and the colors. I also like the thickness of the shirts. All of the shirts I've bought, black, blue, etc, have white buttons. Which makes them more of a casual shirt. But well worth the price.
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Reviewed in the United States on November 10, 2025